LetAbacus - Soroban for Kids

A soroban (Japanese abacus) app that parents can safely hand to young kids. There is almost no text on screen — kids learn through animated demos, glowing beads and cheerful voice encouragement. Mistakes never get a big red X, just a friendly "try again!". ‧ A real-feel virtual abacus: multi-touch beads with a satisfying wooden click. ‧ Lesson mode: 8 units, 18 lessons — from meeting the abacus and simple add & subtract, through friends-of-5, friends-of-10, mixed complements and running sums, to a final challenge-cup unit. Every lesson in three steps — watch, follow the glowing beads, then try it yourself for three stars. ‧ Sense Island: count at a glance, how-many-more to 5 and 10, which side has more, and peek-and-rebuild bead memory — number sense before numerals. ‧ Visual drills: read the number, flick the beads. Difficulty follows your child's lesson progress — it never asks what hasn't been taught yet. ‧ Listening drills at your child's pace: the app calls one term ("five"), waits until the beads really show 5, then calls the next ("plus three"). Three paces (slow / medium / fast), with one replay if missed. ‧ Bead skins to collect: wooden, candy, starry night, dino and more — 9 skins, all unlocked by practicing — never bought with money. ‧ Voice encouragement in both English and Traditional Chinese. ‧ A parent zone behind a parental gate: progress overview, a "5 minutes today" suggestion, language and pace settings. Our promise: completely free, no ads, no tracking, no data collection. All learning content and progress work fully offline. An optional tip jar (buy the developer a coffee) lives behind the parental gate, is handled by Apple, is unreachable by children, and unlocks nothing.